The company analyzed its 2.5 million user profiles for people who have switched jobs in the last two years, and found that for every one person who left Twitter, the company hired 10.9 more.

Other companies with a great hired-to-left ratio include the other pre-IPO giants: Facebook (8.1 to 1), Zynga (8.0), LinkedIn (7.5), and Groupon (3.5).

In the losers' bracket, Yahoo hired only 0.3 TopProspect employees for every one who left and Microsoft's ratio was 0.4. Other slow growers include Intuit and Google, both with a ratio of 1.2.

TopProspect gathered the information from more than 2.5 million user profiles, which include job information uploaded from LinkedIn and Facebook.

TopProspect also released an infographic showing migrations between six specific companies. Here, Facebook is the biggest gainer -- look at all that traffic from Microsoft and Google -- while Yahoo is the biggest loser once again.